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<p>in terms of a meaningful definition of strength (or toughness).  There has again been extensive study of this issue.</p>

<p><big> Poisson's Ratio </big></p>
<p>Richard Christensen, a doctor in engineering mechanics, argues that ductility in an isotropic material can be quantified in terms of <a href="page.php?w=poisson%27s_ratio">poisson's ratio</a>.  In particular, he manipulates the formula for converting a material's <a href="page.php?w=bulk_modulus">bulk modulus</a>  to <a href="page.php?w=shear_modulus">shear modulus</a>  via <a href="page.php?w=poisson%27s_ratio">poisson's ratio</a></p><p>
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